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1
Water Balance
1.
Continuity equation for a hydrologic system
I - O = S/t
in volume/time or
It - Ot = S in volume
I is Inflow; O is outflow; S is the change of storage
within the hydrologic system, for a specific period of
time, t.
Inflow, I
S
Storage, S

1
Exam Three
Sample question
1. Determine the diameter of concrete pipe needed to deliver water at a flow rate of 3 m 3/s from a
reservoir with a water surface elevation of 70 m to a reservoir with a water surface elevation of 40
m. The pipe is 2000 m lon

1
Hydrologic Cycle
Our world is represented by the cycle.
It is the center of hydrology.
Subjects (topics) to be covered in this course revolve around
this center (cycle): surface and groundwater hydrology and
hydraulics.
The total volume of water on,